Xfiltration



J. A. PICKARD July 25, 1933.

FILTRATION 2 Sheets-Sheet 1 Filed Feb. 9, 1931 Invenfir: Jbweyvii wzzew mr 6 i; V/QWM July 25, 1933. A PlcKARD 1,919E7Q FILTRATION Filed Feb. 9, 1931 2 Sheets-Sheet 2 I we nfor: Jsqpkfiliemla'okard,

Patented July 25, I 1933 I WHE JosErn ALLEN PIQKARD,-OF- Lennon, nnerlann, ASSIGNOR To METAnILTERsinsae) IMIT D, or IMIDDLESEX, ENGLANDLI'A' BRITISH COMPANY I FILTRATION Afiplicationfiled February a, 1931, se ial at, 514,571 and 111' reat Britain any 10, 1930.

c This invention relates to filtration and has for its chief object to provide a new or improved method of and means for filtration'of liquids containing impurities or suspended in suspension. y

In accordance with the present invention filter comprises a support, a hollow shaft matter with or without filter aid material also" mounted thereon for rotation about a hori-' zontal axis, a filter chamber secured to and communicating with said shaft, a plurality of inwardly draining filter units of the multiple-plate assembly type grouped onhori- Zontal axes within said chamber, means Withinsaid chamber supporting saidu nit's at their ends, means for bodily rotatingthe chamber together with said units, meansfor c onduc t in the fluid to. be filtered through said shaft into the chamber andabout said units, and means for conducting the filtered fluid away from the interior of said units and out of said chamber during rotation.

i In order that the invention may be clearly understood and readily carried into efiectthe same will now be describedmorefully with reference to the accompanying drawings which i H Figure 1 is a longitudinal sectional eleva tion, of a; filter of the multiple plate type adapted to operate in'accordance with the ins vention, and 1 igure 2 is a similarelevation of a modified construction. 7 f Referring first to Figure lyit is seen that the filter chamber 1 is of-cylindrical form and is bolted at 2 to one end oi-a horizontal hollow shaft 3, the-latter having a deepfiange 4 whichserves as an end wall or cover plate to the chamber 1.

The shaft 3 is mounted in suitable bearings 5 on a supporting bracket or pillar 6 upstanding from a] base 7 mounted on a travelling platform 8 so that thefilter can be transported easily from place to place. On the shaft 3 is secured a toothed wheel 9 connected by a chain 10 with a gear box 11 and motor 12. WVithin the chamber 1 are two transverse plates 13 and 14 in which are mounted the endsof a group of filtering units 15 each-of which may consist of a perforated tube on which is arranged a, pile of filter discs spaced a predetermined distanceiapart in any known manner, as forfexample' 'by means of spacing ternate discs. Each tube isclosedat the end secured to the end plate '13 but is open at the end secured in the plate 14;. .In' place of perforated tubes,-other 'meansias for example the annular'space'19between the inner and outer shafts 16 and 3 respectively, j 20 is an inlet pipe'in communication with I From the" foregoing description the man-[ s ner in which the filter operates will be read{ ily understood. The material to be filtered enters through the'pipe 20, passes along the interior-lfof the shaft'16 andiemergesth'rough astudsorprotuberances on the discs .or on al 5c shaft 3 are spacedaparttoprovideainarrow annular chamber 18-111 communication with 7'0 the interior oi the inner shaft 16, and 21 is anf voutlet pipein'communication with the annular-space19. -1 Y the. end117 into thechamber beyondthe end plate 14, Thence the liquid passes between the plates of theffilterin the impurities or arrestecf par l n or in wunits 15 leaving the filtering units and thence drainingin" a clearcondition throughthe tubesof the units 15 into the-chamber 18 and, along the annular its contents and the shafts 3 and 16 are rotated at any desired speed.

tions and mayhaveva-riousaccessories, as

prising the chamberrl with end plates 13 and 1 4 and filtering units 15 can'be detached easily from the flange 4; also the filtering units 15and end plates can then be withn 1 space 19 to ltheoutlet '21. During'any part of theffiltering operation or throughoutthe whole filtering periodzthe' chamber 1 with- 7 The apparatus above described is natural- 'ly susceptible of various structural modificadrawn easily from the chamber 1; in large filters the internal face of'the chamber 1 may be formed or provided with guides or run-.

ways to facilitate such withdrawal. .It is also to be observed that the chamber or casing 1 alone may be removed easily when desired and that the fil'tering units 15 can be removed individually from the end plate 14.

"In the modified form of filter represented in Figure 2 the chamber 1 issupported and rotated by the hollow inlet shaft '16 at one end and is supported peripherally at the other end on rollers 1a. The hollow outlet shaft 3 is at the opposite end of the filter and is provided with an extension 24 reach-V ing down towards the lowestfpart of a collecting or drawing off space 25 between the end plate 14: and the adjacent end wall of the chamber 1.

Reverting to. Figure 1 it may be mentioned that the vessel 26v is included in a shunt circuit on-the main. stream for intro ducing any additional substance, into the main stream if and when desire d;this however forms {no part of the'present invention,

Althoughtwo of the preferred embodiments of the present invention have been described it will be apparent that various 'modifications or additions may be made. For exinternally or externally controlled, as for example by a heating orcooling medium circulated through coils or through ajacket or by an externally applied fiameor by enclos- ,7 ingthe whole or a part oflthefilter, within a r of; establishing variousqfiltering effects or heating chamber. I c p i The passage of the fluid to. be filtered may befeifected bypressure or suction and if desired filter aidmay'be first deposited on the filtering units from suspension, and in fact the rotational property of the filter is of great advantage and importance in thisre spect as it ensures a uniform distribution of the filter 'aid oil-filtering units of the plate assembly type and the possibility of using various filtering materials especially mate: rials not otherwise suitable as filter aids and conditions. Also in order to carry up and distribute over the filtering units any filter aidmaterial supplied to the filter it may be provided internally with vanes or battles to ensure such distribution. Y

What I claim is v d 1. A filter comprising a support, a hollow shaft mounted thereon for rotation about a horizontal axis, a filter chamber secured to and communicating with said shaft, a plurality of inwardly draining filter units of the multiple-plate assembly type grouped on horizontal axes within said chamber, means within said chamber supporting saidunits at their ends, means for bodily rotating the chamber together with said units, means for conducting the fluid to be filtered through said shaft into the chamber and about said units,and means for conducting the filtered fluid away from the interior of said units and out of said chamber during rotation, said means connecting with a conduitwithin the chamber said conduit being freely suspended therein with its lower open end at substantially' the lowest point in the said chamber.

2. A filter comprising supports, hollow shafts mounted therein for rotation about a horizontal axis, a filter chamber secured to and communicating with one of said shafts, a plurality of inwardly drainingfilter units of the multiple-plate assembly type grouped on horizontal axes within said chamber each unlt having one end closed and one end open andbeing mounted between transverse end plates through one of which the said open ends of the units project into a second chamber formed by thG' SZLiC l end plate and part of the shell of the first mentioned chamber, means for bodily rotating the chamber together with said units, means for conducting the fluid tobe filtered through said shaft into the first mentioned chamber and about saidunits, and means for conducting the filtered fluid awayfromtheinterior of said units into said second mentioned chamber and therefromto an outlet during rotation, said means connecting with a conduit within the chamber said conduit being freely inc its

suspended therein withvits lower open end at substantially the lowest point in the said secondfmentioned chamben JOSEPH ALLEN PI'OKARD. 

